25-22. Additional information on approved life preservers can be found in chapter 12. The procedures for deliberate water landings with a life preserver are: Jumpers may wear combat equipment only after it has been waterproofed and float-checked. To waterproof equipment, use bags and rigger tape inside equipment containers. Float check by submerging in a tank of water until saturated and ensure the equipment is neutral or positive buoyant (floats). Jumpers wear service approved life preservers. Jumpers wear the approved waterborne operations helmet or a service approved helmet during WDZ operations. Jumpers jumping in cold water (60 degrees or below) wear wetsuits or dry suits and may wear a wetsuit or dry suit hood under the ballistic helmet. Jumpers may wear wetsuit booties, coral booties, or tennis shoes, these shoes WILL BE closed toe shoes. Jumpers may follow equipment such as door bundles and combat rubber raiding craft on a single ship operation. There are three seconds between the cargo exit and the first jumper’s exit to ensure the jumpers do not become entangled with the cargo. The cargo and jumpers are hooked to the same anchor line cable on the same side when jumping the ramp.